package adv324;

/**
 * @author oldliu
 * @since 1.0
 */
public class StrTest {
    public static void main(String[] args) {
        String s=null;
        String s1=new String(new byte[]{65,66,67});
        System.out.println(s1);
        String s2=new String(new char[]{21016,21017,15001,66,80});
        System.out.println(s2);
        String s3="我love java";
        s3="赵俊杰也喜欢java";

        s3=s3.toUpperCase();//大写
       // s3.toLowerCase()
        System.out.println(s3);
        char c=s3.charAt(3);
        System.out.println(c);
    }
}
